Which of the following joints would allow no movement?
1. Fibrous joint
2. Cartilaginous joint
3. Synovial joint
4. Ball and socket joint
The wheat grain has an embryo with one large, shield-shaped cotyledon known as?
1. epiblast
2. coleorrhiza
3. scutellum
4. coleoptile
A gene showing co-dominance has?
1. | One allele is dominant on the other |
2. | Alleles are tightly linked on the same chromosome |
3. | Alleles that are recessive to each other |
4. | Both alleles are independently expressed in the heterozygote |
Which of the following structure is not found in a prokaryotic cell?
1. Nuclear envelope
2. Ribosome
3. Mesosome
4. Plasma membrane
The term "linkage" was coined by?
1. T.H. Morgan
2. T.Boveri
3. G.Mendel
4. W.Sutton
The imperfect fungi which are decomposers of litter and help in mineral cycling belong to?
1. Deuteromycetes
2. Basidiomycetes
3. Phycomycetes
4. Ascomycetes
Match the columns and identify the correct option.
Column I | Column II | ||
A. | Thylakoids | (i) | Disc-shaped sacs in Golgi apparatus |
B. | Cristae | (ii) | Condensed structure of DNA |
C. | Cisternae | (iii) | Flat membranous sacs in stroma |
D. | Chromatin | (iv) | Infolding in mitochondria |
1. A → (iv) B → (iii) C → (i) D → (ii)
2. A → (iii) B → (iv) C → (i) D → (ii)
3. A → (iii) B → (i) C → (iv) D → (ii)
4. A → (iii) B → (iv) C → (ii) D → (i)
Select the wrong statement:
1. | The viroids were discovered by D.J lvanowsky. |
2. | W.M. Stanley showed that viruses could be crystallized. |
3. | The term 'contagium vivum fluidum' was coined by MW Beijerinck. |
4. | Mosaic disease in tobacco and AIDS in human beings are caused by viruses. |
During biological nitrogen fixation, inactivation of nitrogenase by oxygen poisoning is prevented by?
1. Leghaemoglobin
2. Xanthophylls
3. Carotene
4. Cytochrome
The species confined to a particular region and not found elsewhere are termed as:
1. | Keystone | 2. | Alien |
3. | Endemic | 4. | Rare |